Getting "Unexpected end of JSON input" when building a next.js app

[IsmailAlamKhan]

Steps to reproduce

Steps:
1.
2.
3.

Current behavior

No response

Expected behavior

No response

Context

I have been using Material UI on my next.js project since a long time and haven't face this issue but suddenly today when I was trying to build the project I keep getting the following error

./node_modules/@mui/lab/LoadingButton/LoadingButton.js + 3 modules
Unexpected end of JSON input

./node_modules/@mui/material/Autocomplete/Autocomplete.js + 6 modules
Unexpected end of JSON input

./node_modules/@mui/material/Backdrop/Backdrop.js + 1 modules
Unexpected end of JSON input

./node_modules/@mui/material/Button/Button.js + 3 modules
Unexpected end of JSON input

./node_modules/@mui/material/ButtonBase/ButtonBase.js + 6 modules
Unexpected end of JSON input

I have searched a lot on this but no solution fixed this issue, if required I can provide the package.json as well.

Your environment

npx @mui/envinfo

  System:
    OS: macOS 15.1
  Binaries:
    Node: 23.2.0 - /opt/homebrew/bin/node
    npm: 10.9.0 - /opt/homebrew/bin/npm
    pnpm: 9.7.1 - /opt/homebrew/bin/pnpm
  Browsers:
    Chrome: 131.0.6778.71
    Edge: Not Found
    Safari: 18.1
  npmPackages:
    @emotion/react: ^11.11.1 => 11.13.5 
    @emotion/styled: ^11.11.0 => 11.13.5 
    @mui/base:  5.0.0-beta.40 
    @mui/core-downloads-tracker:  6.1.8 
    @mui/icons-material: ^6.1.8 => 6.1.8 
    @mui/lab: ^5.0.0-alpha.173 => 5.0.0-alpha.173 
    @mui/material: ^6.1.8 => 6.1.8 
    @mui/private-theming:  6.1.8 
    @mui/styled-engine:  6.1.8 
    @mui/system:  6.1.8 
    @mui/types:  7.2.19 
    @mui/utils:  5.16.6 
    @mui/x-data-grid: ^7.22.2 => 7.22.2 
    @mui/x-date-pickers: ^7.22.2 => 7.22.2 
    @mui/x-internals:  7.21.0 
    @types/react: ^18.0.0 => 18.3.12 
    react: ^18 => 18.3.1 
    react-dom: ^18 => 18.3.1 
    styled-components: ^6.1.1 => 6.1.13 
    typescript: ^5.5.4 => 5.6.3 ```
</details>


**Search keywords**: next.js, build

[DiegoAndai]

Hey @IsmailAlamKhan, thanks for the report and for using Material UI 😊.

Could you provide a reproduction? This would help debug the issue a lot. For example, if you could share a repository with your project, that would work. Even better if it's a minimal reproduction. Thank you!

[IsmailAlamKhan]

Hey thanks a lot for responding I really appreciate it.

I wasn't able to reproduce this on another project but one thing is I was on Node.JS 23 so I asked my colleague to try it. He had Node.JS 22 and the same project built without any issues. So I tried the same on Node.JS 22 and it works now. So maybe it's an issue with Node.JS 23? Also one thing the same project built on my Windows PC without any issues.

[asimovc]

I having the same problem and get this error when compiling with npm run build

 [email protected] build
> next build

  ▲ Next.js 14.2.11
  - Environments: .env

   Creating an optimized production build ...
Failed to compile.

./node_modules/@mui/material/Avatar/Avatar.js + 2 modules
Unexpected end of JSON input

./node_modules/@mui/material/Box/Box.js + 2 modules
Unexpected end of JSON input

./node_modules/@mui/material/Button/Button.js + 3 modules
Unexpected end of JSON input

./node_modules/@mui/material/ButtonBase/ButtonBase.js + 9 modules
Unexpected end of JSON input

./node_modules/@mui/material/DefaultPropsProvider/DefaultPropsProvider.js + 1 modules
Unexpected end of JSON input


> Build failed because of webpack errors

[FrankChen021]

Same problem suffered when running npm run build under v23.2.0 on macOS

node --version
v23.2.0

  ▲ Next.js 14.2.8
  - Environments: .env.local

   Creating an optimized production build ...
Failed to compile.

./node_modules/@mui/material/ButtonBase/ButtonBase.js + 5 modules
Unexpected end of JSON input

./node_modules/@mui/material/IconButton/IconButton.js + 1 modules
Unexpected end of JSON input

./node_modules/@mui/material/LinearProgress/LinearProgress.js + 1 modules
Unexpected end of JSON input

./node_modules/@mui/material/Popper/Popper.js + 56 modules
Unexpected end of JSON input

./node_modules/@mui/material/Tooltip/Tooltip.js + 2 modules
Unexpected end of JSON input


> Build failed because of webpack errors

dependencies of mui in the package.json are:

    "@mui/icons-material": "^6.1.0",
    "@mui/material": "^6.1.0",
    "@mui/x-date-pickers": "^7.17.0",

[FrankChen021]

After switching the node from v23 to v22.11.0(LTS) and cleaning up the .next folder and then re-build, the problem was resolved.